Aiming at the problem of target detection and parameter estimation of centralized MIMO radar, an optimization method is proposed to improve the performance of MIMO radar parameter estimation and detection.By using the skew-symmetry of covariance of the received data, a linear programming method is proposed for target detection under the generalized likelihood ratio criterion.The simulation results show that, this method can improve the detection probability and parameter estimation accuracy of radar target, implement sidelobe suppression well, and has shorter running time.